1. Department of Rehabilitation Medicine, University of Occupational and Environmental Health, Kitakyushu, Japan
2. Department of Preventive Medicine and Community Health, School of Medicine, University of Occupational and Environmental Health, Kitakyushu, Japan
3. Department of Urology, University of Occupational and Environmental Health, Kitakyushu, Japan
4. Department of Health Policy and Informatics, Tokyo Medical and Dental University Graduate School, Tokyo, Japan